WO2017175826A1

WO2017175826A1 - Communication device, communication system, communication method, and non-transitory computer-readable medium

Info

Publication number: WO2017175826A1
Application number: PCT/JP2017/014349
Authority: WO
Inventors: 重孝東郷; 亮西堀
Original assignee: 日本電気株式会社; ソフトバンク株式会社
Priority date: 2016-04-08
Filing date: 2017-04-06
Publication date: 2017-10-12
Also published as: JP6598335B2; EP3442190A4; JPWO2017175826A1; US10666502B2; EP3442190A1; EP3442190B1; US20190165994A1

Abstract

The objective is to provide a communication device capable of improving the communication reliability and communication quality of a communication network. The disclosed communication device (10) is equipped with: a transmission unit (11) that transmits packets to a counterpart communication device (20) via a communication line (31); a transmission unit (12) that transmits packets to the counterpart communication device (20) via a communication line (32); a packet generation unit (13) that duplicates the packets to generate a plurality of packets; a monitoring unit (15) that monitors the communication state of the communication line (31) and the communication line (32); and a control unit (14) that, in response to the communication states, makes a determination regarding using the communication line (31) and/or the communication line (32) to transmit two or more packets among the plurality of duplicated packets to the counterpart communication device (20).

Description

Communication apparatus, communication system, communication method, and non-transitory computer-readable medium

The present disclosure relates to a communication device, a communication system, a communication method, and a program, and more particularly, to a communication device, a communication system, a communication method, and a program that use a plurality of communication lines.

Communication systems that transmit packets are required to have high reliability such as a low packet loss rate. In recent years, even when a communication line used between communication apparatuses is a best effort line, high reliability may be required.

Patent Document 1 describes a configuration example of a communication network that realizes high reliability. Specifically, the communication network includes a packet transfer device on each of the packet transmission side and the packet reception side. Two or more independent paths are set between the packet transfer apparatuses. The packet transfer apparatus on the transmission side copies the packet to generate two or more packets. Furthermore, the packet transfer apparatus on the transmission side outputs two or more copied packets to independent paths. Thereby, the same packet is transmitted in two or more independent paths. As a result, even if a packet loss occurs in one path, the packet is transmitted via the other path, so that the probability that the packet reaches the receiving side packet transfer apparatus can be improved.

JP 2006-174406 A

However, the communication network disclosed in Patent Document 1 has a problem that the reliability or quality of the communication network is lowered when a failure occurs in one of two independent routes. Specifically, when a failure occurs in one path, only one path between the packet transfer apparatuses is used. However, if the communication quality of the route used for packet transmission deteriorates, the packet transfer device on the transmission side cannot select another route. As a result, the packet transfer apparatus on the transmission side uses a path with deteriorated communication quality, and the packet loss rate increases.

An object of the present disclosure is to provide a communication device, a communication system, a communication method, and a program that can improve the reliability and communication quality of a communication network.

A communication device according to a first aspect of the present disclosure includes a first transmission unit that transmits a packet to a communication device that is opposed to the communication device via a first communication line, and the communication device that is opposed via a second communication line. A second transmission unit that transmits packets to the packet, a packet generation unit that replicates packets to generate a plurality of packets, a monitoring unit that monitors communication states of the first communication line and the second communication line, , According to the communication state, using at least one of the first communication line and the second communication line to transmit two or more of the copied packets to the facing communication device A control unit for determining.

The communication system according to the second aspect of the present disclosure uses at least one of the first communication line and the second communication line according to a communication state of the first communication line and the second communication line. Receiving a plurality of duplicated packets via a transmitting device that transmits two or more of the plurality of duplicated packets to the receiving device and at least one of the first communication line and the second communication line. And a receiving device that deletes duplicate packets.

The communication method according to the third aspect of the present disclosure monitors the communication state of the first communication line and the second communication line, generates a plurality of packets by duplicating the packet, and according to the communication state, Using at least one of the first communication line and the second communication line, two or more packets among a plurality of copied packets are opposed to each other via the first communication line and the second communication line. To the communication device.

The program according to the fourth aspect of the present disclosure monitors a communication state of the first communication line and the second communication line, duplicates a packet to generate a plurality of packets, and, according to the communication state, Using at least one of the first communication line and the second communication line, two or more of the duplicated packets are opposed to each other via the first communication line and the second communication line. Transmission to the communication device is executed by the computer.

According to the present disclosure, it is possible to provide a communication device, a communication system, a communication method, and a program that can improve the reliability and communication quality of a communication network.

1 is a configuration diagram of a communication system according to a first exemplary embodiment; FIG. 3 is a configuration diagram of a communication system according to a second exemplary embodiment. FIG. 3 is a configuration diagram of a transmission device according to a second exemplary embodiment; FIG. 10 is a diagram illustrating a flow of packet transmission processing in the transmission device according to the second exemplary embodiment; FIG. 10 is a diagram showing a flow of processing relating to packet generation processing according to the second exemplary embodiment; FIG. 3 is a configuration diagram of a receiving device according to a second exemplary embodiment; FIG. 10 is a diagram showing a flow of packet reception processing in the receiving apparatus according to the second exemplary embodiment; FIG. 10 is a diagram illustrating a flow of packet transmission processing in the transmission device according to the third exemplary embodiment; FIG. 6 is a configuration diagram of a communication system according to a third exemplary embodiment. FIG. 10 is a diagram illustrating a flow of packet transmission processing in the transmission device according to the fourth exemplary embodiment; FIG. 10 is a diagram illustrating a flow of packet transmission processing in the transmission device according to the fourth exemplary embodiment; It is a block diagram of the transmission apparatus and receiving apparatus concerning each embodiment.

(Embodiment 1)
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. A configuration example of the communication system according to the first embodiment of the present disclosure will be described with reference to FIG. The communication system in FIG. 1 includes a communication device 10 and a communication device 20. In the communication system of FIG. 1, the communication apparatus 10 is mainly an apparatus that transmits a packet, and the communication apparatus 20 is an apparatus that receives a packet.

The communication device 10 and the communication device 20 may be computer devices that operate when a processor executes a program stored in a memory. The communication device 10 and the communication device 20 may be a relay device for relaying data. The communication device 10 and the communication device 20 may be, for example, a router device.

A communication line 31 and a communication line 32 are set between the communication device 10 and the communication device 20. The communication line 31 and the communication line 32 may be a communication line in which a wireless communication line is used as a part of a communication path, may be a communication line constituted only by a wireless communication line, or only a wired communication line. The communication line comprised by these may be sufficient.

Subsequently, a configuration example of the communication device 10 will be described. The communication device 10 includes a transmission unit 11, a transmission unit 12, a packet generation unit 13, a control unit 14, and a monitoring unit 15. The constituent elements of the communication device 10 such as the transmission unit 11, the transmission unit 12, the packet generation unit 13, the control unit 14, and the monitoring unit 15 are executed by the processor executing a program stored in the memory. May be software or modules. Or the component which comprises the communication apparatus 10 may be hardware, such as a circuit or a chip | tip.

The transmitting unit 11 transmits a packet to the opposing communication device 20 via the communication line 31. The transmission unit 12 transmits a packet to the opposing communication device 20 via the communication line 32.

The packet generator 13 duplicates one packet and generates a plurality of packets. The monitoring unit 15 monitors the communication state of the communication line 31 and the communication line 32. The communication state may be, for example, a communication state or communication quality. In other words, the monitoring unit 15 also monitors whether or not communication using the communication line 31 and the communication line 32 can be performed, or whether or not the communication quality of the communication line 31 and the communication line 32 is deteriorated. Good.

The control unit 14 uses the at least one of the communication line 31 and the communication line 32 according to the communication state to transfer two or more packets generated by the packet generation unit 13 to the facing communication device 20. Decide to send.

For example, the control unit 14 may determine to transmit two or more packets among the plurality of packets to the communication device 20 using the communication line 31 and the communication line 32. Alternatively, the control unit 14 may determine to transmit two or more packets among the plurality of packets to the communication device 20 using only the communication line 31. Alternatively, the control unit 14 may determine to transmit all of the copied packets to the communication device 20 using only the communication line 31.

As described above, when using two communication lines, the communication device 10 can output the same packet to each of the two communication lines. Thereby, the probability that the packet arrives at the communication device 20 can be improved. Further, even when only one of the communication line 31 and the communication line 32 is used, the communication device 10 can output two or more packets to the line to be used. This also can improve the probability that a packet arrives at the communication device 20.

As a result, by using the communication device 10, the reliability and communication quality of the communication network including the communication device 10 and the communication device 20 can be improved.

(Embodiment 2)
Subsequently, a configuration example of the communication system according to the second embodiment of the present disclosure will be described with reference to FIG. The communication system in FIG. 2 includes a communication terminal 40, a network device 42, a transmission device 44, a reception device 46, a network 51, and a network 52.

The transmission device 44 corresponds to the communication device 10 of FIG. The receiving device 46 corresponds to the communication device 20 in FIG. The transmission device 44 duplicates the packet transmitted from the communication terminal 40 and generates a plurality of packets. The transmission device 44 transmits the generated plurality of packets to the reception device 46. In addition, the reception device 46 transmits the packet transmitted from the transmission device 44 to the network device 42.

The communication terminal 40 transmits a packet to the network device 42 via the transmission device 44, at least one of the network 51 and the network 52, and the reception device 46. The network device 42 may be a node device managed by a communication carrier. The node device is a device that is arranged in a network managed by a communication carrier and relays a packet.

The transmission device 44 may be connected via a wireless communication line when connecting to the network 51 and the network 52, for example. Alternatively, the transmission device 44 may be connected to one of the network 51 and the network 52 via a wireless communication line and connected to the other via a wired communication line. Alternatively, the transmission device 44 may be connected via a wired communication line when connecting to the network 51 and the network 52.

The wireless communication line may be, for example, mobile communication or wireless LAN (Local Area Network) communication. The wireless communication line may be referred to as a mobile network line. The mobile communication may be, for example, a wireless communication system defined as 3G in 3GPP (3rd Generation Generation Partnership Project) or a wireless communication system specified as LTE (Long Term Term Evolution).

The wired communication line may be, for example, an optical communication line or a communication line using Ethernet (registered trademark). The network 51 may be operated by a telecommunications carrier that is different from the telecommunications carrier that operates the network 52. When using mobile communication, the transmission device 44 performs wireless communication with a base station arranged in the network 51 or the network 52. When the network 51 and the network 52 are operated by different communication carriers, the transmission device 44 communicates with a base station arranged in the network 51 and also communicates with a base station arranged in the network 52. When wireless LAN communication is used instead of mobile communication, the transmission device 44 communicates with the access point instead of the base station.

Further, when the transmission device 44 is connected to the network 51 and the network 52 using a wireless communication line, the transmission device 44 may use a frequency different from the frequency used when communicating with the network 52 as the frequency used when communicating with the network 51. Good.

Thus, by making the network 51 and the network 52 independent, in other words, the network 51 and the network 52 are different types of networks, the transmission device 44 transmits the packet to the reception device 46 using different paths. be able to. As a result, it is possible to avoid a situation in which the network 51 and the network 52 cannot be used simultaneously.

Subsequently, a configuration example of the transmission device 44 according to the second embodiment of the present disclosure will be described with reference to FIG. The transmission device 44 has a configuration in which a reception unit 61 is added to the communication device 10 of FIG. Since the configuration of the transmission device 44 other than the reception unit 61 is the same as the configuration of the communication device 10, detailed description thereof is omitted.

The receiving unit 61 receives a packet transmitted from the communication terminal 40. The receiving unit 61 outputs the received packet to the packet generating unit 13. The receiving unit 61 is connected to the communication terminal 40 via a wireless communication line or a wired communication line. As the wireless communication line, for example, wireless LAN communication may be used, or near field communication such as Bluetooth (registered trademark) may be used. The wired communication line may be, for example, an optical communication line or a communication line using Ethernet (registered trademark).

The packet generator 13 receives the packet output from the receiver 61. The packet generation unit 13 duplicates the received packet and generates a plurality of packets. A packet generated by duplicating the packet output from the receiving unit 61 may be referred to as a redundant packet.

Subsequently, a flow of packet transmission processing in the transmission device 44 according to the second embodiment of the present disclosure will be described with reference to FIG. First, the receiving unit 61 receives a packet transmitted from the communication terminal 40 (S11).

Next, the packet generator 13 duplicates the packet received by the receiver 61 and generates a plurality of packets (S12). The packet generator 13 may generate, for example, as many packets as the transmitter included in the transmitter 44. Specifically, the transmission device 44 includes a transmission unit 11 and a transmission unit 12. Thus, the packet generator 13 may generate a total of two packets by duplicating one packet together with the packet transmitted from the communication terminal 40. Alternatively, the packet generator 13 may generate a larger number of packets than the number of transmitters included in the transmitter 44.

Next, the monitoring unit 15 performs communication confirmation regarding the communication line used by the transmission unit 11 and the communication line used by the transmission unit 12. The monitoring unit 15 determines whether only one of the communication line used by the transmission unit 11 and the communication line used by the transmission unit 12 is unusable (S13). For example, the monitoring unit 15 transmits a health check request message to the reception device 46 via the transmission unit 11 and the transmission unit 12. When the health check response message is received within the specified time, the monitoring unit 15 determines that the communication line that has output the health check request message can be used. If the health check response message is not received within the specified time, the monitoring unit 15 determines that the communication line that has output the health check request message cannot be used. Alternatively, the monitoring unit 15 repeats transmission of the health check request message a predetermined number of times, and determines that the communication line cannot be used when the health check response message for all the health check request messages cannot be received. May be.

When the monitoring unit 15 determines that only one of the communication lines is unusable, the control unit 14 outputs the plurality of packets generated in step S12 to the other usable communication line ( S14). That is, the control unit 14 outputs the packet transmitted from the communication terminal 40 and the redundant packet to the receiving device 46 via the transmission unit 12 when the communication line used by the transmission unit 11 is unusable.

When the monitoring unit 15 determines that only one of the communication lines is unusable, the monitoring unit 15 determines whether or not both communication lines are unusable (S15). When the monitoring unit 15 determines that both communication lines are unusable, the control unit 14 stops packet transmission (S16). When the monitoring unit 15 determines that both communication lines are not usable, in other words, both communication lines are usable, the control unit 14 outputs the generated packet to both communication lines ( S17). For example, when one redundant packet is generated in step S12 and a total of two packets are generated, the control unit 14 outputs the packets one by one to the transmission unit 11 and the transmission unit 12. For example, the control unit 14 may output packets to the transmission unit 11 and the transmission unit 12 at substantially the same timing. Or the control part 14 may output a packet to the transmission part 11, and may output a packet to the transmission part 12 after progress for a fixed period.

Alternatively, when three or more packets are generated in step S12, the control unit 14 may distribute the packets in step S17 as follows. For example, it is assumed that the communication line used by the transmission unit 11 is a wireless communication line, and the communication line used by the transmission unit 12 is a wired communication line. In general, wireless communication lines often have lower communication quality than wired communication lines. Therefore, the control unit 14 may output more packets to the wireless communication line than the wired communication line.

Alternatively, it is assumed that both the transmission unit 11 and the transmission unit 12 perform mobile communication in which an upper limit value of the data communication amount is determined. In this case, the control unit 14 may output many packets to the transmission unit having the larger difference between the upper limit value and the current communication amount.

Subsequently, a detailed processing flow regarding the packet generation processing in step S12 will be described with reference to FIG. In FIG. 5, it is assumed that the data size of the packet received by the receiving unit 61 is larger than MTU (Maximum Transmission Unit).

First, the packet generation unit 13 executes a fragment function (S21). Specifically, the packet generation unit 13 divides the data received by the reception unit 61 into a plurality of data so that the data size of the packet fits in the MTU.

Next, the packet generator 13 adds a header including a sequence number to the divided data (S22). The sequence number is a number indicating the order of messages, for example. The header including the sequence number may be an IP (Internet protocol) header or a header used in a protocol different from the IP header. Next, the packet generator 13 duplicates the packet generated in step S22 (S23). For example, the packet generation unit 13 may copy the packets so that the number of packets is equal to or greater than the number of transmission units included in the transmission device 44.

Note that if the data size of the packet received by the receiving unit 61 is smaller than the MTU, the process of step S21 is omitted.

Subsequently, a configuration example of the receiving device 46 according to the second embodiment of the present disclosure will be described with reference to FIG. The reception device 46 includes a reception unit 71, a reception unit 72, a control unit 73, and a transmission unit 74. The constituent elements of the receiving device 46 such as the receiving unit 71, the receiving unit 72, the control unit 73, and the transmitting unit 74 are software or modules in which processing is executed by the processor executing a program stored in the memory. It may be. Or the component which comprises the receiver 46 may be hardware, such as a circuit or a chip | tip.

The reception unit 71 receives a packet transmitted from the transmission unit 11 of the transmission device 44 via the network 51. The receiving unit 71 outputs the received packet to the control unit 73. The reception unit 72 receives a packet transmitted from the transmission unit 12 of the transmission device 44 via the network 52. The receiving unit 72 outputs the received packet to the control unit 73.

The control unit 73 outputs the packets received from the reception unit 71 and the reception unit 72 to the transmission unit 74. In addition, the control unit 73 deletes duplicate packets. For example, when the control unit 73 receives from the reception unit 71 or the reception unit 72 a packet in which the same sequence number as the packet already output to the transmission unit 74 is set, the control unit 73 may delete the received packet.

Subsequently, a flow of packet reception processing in the reception device 46 according to the second embodiment of the present disclosure will be described with reference to FIG. First, the receiving unit 71 and the receiving unit 72 receive a packet transmitted from the transmitting device 44 (S31). Next, the control unit 73 determines whether or not the packets received from the receiving unit 71 and the receiving unit 72 are the same as the previously received packet (S32). In other words, the control unit 73 determines whether or not the packet received from the reception unit 71 and the reception unit 72 is the same packet that has already been output to the transmission unit 74. For example, when the packet received from the receiving unit 71 and the receiving unit 72 has the same sequence number as the packet already output to the transmitting unit 74, the control unit 73 determines that the packet received from the receiving unit 71 and the receiving unit 72 is It is determined that it is the same as the packet received previously.

Next, when the control unit 73 determines that the packet received from the reception unit 71 and the reception unit 72 is the same as the previously received packet, the control unit 73 deletes the received packet (S33).

When the control unit 73 determines in step S32 that there is no duplicate packet or deletes the duplicate packet in step S33, the control unit 73 performs packet order correction (S34). The control unit 73 executes the processes after step S35 in the order of the sequence numbers. Here, it is assumed that the control unit 73 receives a packet in which a sequence number to which a value of 2 or more is added is set without adding the sequence numbers one by one. In this case, the control unit 73 temporarily stores the received packet in a buffer or the like. When the control unit 73 receives a packet in which a sequence number obtained by adding 1 to the sequence number set in the packet that has already been output to the transmission unit 74 is received, the control unit 73 performs the processing from step S35 on the received packet. Further, the control unit 73 executes the processing after step S35 in the order of the sequence numbers of the packets stored in the buffer.

Next, the control unit 73 determines whether or not the order-corrected packet is a packet divided by fragments (S35). The control unit 73 may check the header of the packet, and may determine that the packet is divided by the fragment if a flag indicating that the fragment has been executed is set.

When the control unit 73 determines that the packet subjected to the order correction is not a packet divided by fragments, the control unit 73 transmits the packet to the network device 42 via the transmission unit 74 (S37).

When the control unit 73 determines that the packet subjected to the order correction is a packet divided by fragments, the control unit 73 reconfigures the packet (S36). Next, the control unit 73 transmits the reconstructed packet to the network device 42 via the transmission unit 74 (S37).

As described above, by using the communication system according to the second embodiment of the present disclosure, the transmission device 44 can transmit a plurality of packets to the reception device 46 via two communication lines. As a result, the probability that the packet reaches the receiving device 46 can be increased. When one communication line is unusable, a plurality of packets including redundant packets can be output to the other communication line. As a result, compared to the case where only one packet is output to one communication line, a plurality of packets including redundant packets are output to one communication line, thereby increasing the probability that the packet will reach the receiving device 46. can do.

In addition, when receiving a plurality of packets including redundant packets, the receiving device 46 can reduce the number of packets subject to order correction by deleting duplicate packets. As a result, the receiving device 46 can reduce the processing load when performing the order correction.

(Embodiment 3)
Subsequently, a flow of packet transmission processing in the transmission device 44 according to the third embodiment of the present disclosure will be described with reference to FIG. Steps S41 and S42 are the same as steps S11 and S12 of FIG.

When a plurality of packets are generated in step S42, the monitoring unit 15 determines whether or not the communication quality of one communication line is good (S43). For example, the monitoring unit 15 determines whether or not the communication quality of the communication line via the network 51 is good. The monitoring unit 15 may acquire information regarding the communication quality of the communication line via the network 51 from the receiving device 46. For example, the monitoring unit 15 may acquire information related to communication quality from the receiving device 46 via the network 51. Alternatively, the monitoring unit 15 may acquire information regarding communication quality from the reception device 46 via a network different from the network 51. The network different from the network 51 may be the Internet, for example. Or as shown in FIG. 9, the monitoring part 15 may acquire the information regarding communication quality from the management apparatus etc. which manage a communication system via the internet. FIG. 9 shows a configuration in which the management device 48 is connected to the transmission device 44 and the reception device 46 via the Internet. The communication system of FIG. 9 has a configuration in which a management device 48 is added to the communication system of FIG.

The information regarding the communication quality of the communication line via the network 51 may be, for example, a throughput, a packet loss rate, a transmission delay, etc. when data transmission is performed via the communication line in the network 51. For example, the monitoring unit 15 may determine that the communication quality of the communication line in the network 51 is not good when the throughput value received from the receiving device 46 is below a threshold value. In addition, the monitoring unit 15 may determine that the communication quality of the communication line in the network 51 is not good when the value of the packet loss rate received from the receiving device 46 exceeds the threshold value.

When the monitoring unit 15 determines that the communication quality of the communication line in the network 51 is not good, the control unit 14 determines whether or not the communication line in the network 51 can be used (S44). The communication line in the network 51 cannot be used, for example, when the value of the throughput received from the receiving device 46 is below a threshold value lower than the threshold value used for determining the communication quality in step S43. Also good. Further, the fact that the communication line via the network 51 cannot be used means that, for example, the value of the packet loss rate received from the receiving device 46 exceeds the threshold value higher than the threshold value used for determining the communication quality in step S43. It may be in the state.

When it is determined that the communication line in the network 51 can be used, the control unit 14 transmits a plurality of packets to the reception device 46 via the transmission unit 11 (S45). The control unit 14 may determine the number of packets to be transmitted according to the communication quality level of the communication line in the network 51. For example, the control unit 14 may transmit many packets to the reception device 46 via the transmission unit 11 as the communication quality of the communication line in the network 51 becomes lower.

Further, when transmitting a plurality of packets to the receiving device 46 via the transmission unit 11, the control unit 14 may provide a packet transmission interval for a certain period or more. When the packet transmission interval is short and a plurality of packets are transmitted at substantially the same timing, the plurality of packets are transmitted in a state where the communication quality is poor. On the other hand, by providing a packet transmission interval of a certain period or longer, packets can be transmitted in a state where the communication quality is good. In particular, it is known that the communication quality of a wireless communication line varies in a short time. Therefore, the control unit 14 can transmit a plurality of packets at timings with different communication quality by providing a packet transmission interval for a certain period or longer.

If the monitoring unit 15 determines that the communication quality of the communication line through the network 51 is good, and if the control unit 14 cannot use the communication line of the network 51, the control unit 14 passes through the transmission unit 11. A plurality of packets are not transmitted to the receiving device 46 (S46). Specifically, when the monitoring unit 15 determines that the communication quality of the communication line via the network 51 is good, the control unit 14 transmits one packet via the transmission unit 11. The control unit 14 does not transmit a packet via the transmission unit 11 when the communication line of the network 51 cannot be used.

Next, the monitoring unit 15 determines whether or not the communication quality of the communication line different from the communication line determined in step S43 as to whether or not the communication quality is good (S47). That is, the monitoring unit 15 determines whether or not the communication quality of the communication line via the network 52 is good. Since the processes in steps S48 to S50 are the same as those in steps S44 to S46, detailed description thereof is omitted.

As described above, when a communication line with low communication quality is used by executing the transmission processing according to the third embodiment of the present disclosure, a plurality of packets can be transmitted via the communication line. In this way, when a communication line with low communication quality is used, the possibility of a packet reaching the receiving device 46 can be increased by transmitting a plurality of packets. In addition, when a communication line with high communication quality is used, it is not necessary to transmit a plurality of packets via the communication line. As a result, in a communication line with high communication quality, a plurality of packets are not transmitted, so that the throughput can be kept high.

(Embodiment 4)
Subsequently, a flow of transmission processing in the transmission device 44 according to the fourth embodiment of the present disclosure will be described with reference to FIGS. 10 and 11. Steps S51 to S56 in FIG. 10 are the same as steps S11 to S16 in FIG.

In step S55, when the monitoring unit 15 determines that both communication lines can be used, the processing from step S57 is executed. Steps S57 to S62 are the same as steps S43, S45 to S47, S49, and S50 of FIG. That is, since it is determined whether or not the communication line is unusable in the process shown in FIG. 10, the communication line is unusable as shown in FIG. 8 after step S57 in FIG. 11 and after S60. Does not determine whether or not there is.

When the two communication lines can communicate with each other by executing transmission processing as shown in FIGS. 10 and 11, the transmission device 44 sets each communication line according to the communication quality of the two communication lines. It is possible to determine whether or not to transmit a plurality of packets via the network. As a result, when two communication lines can communicate with each other, the same packet is transmitted to both communication lines, so that the possibility that the packet reaches the receiving device 46 can be increased. Furthermore, by determining the communication quality of the two communication lines and outputting a plurality of packets to the communication line with low communication quality, the possibility that the packets will reach the receiving device 46 can be further increased.

Subsequently, configuration examples of the transmission device 44 and the reception device 46 described in the above-described embodiments will be described below with reference to FIG. FIG. 12 is a block diagram illustrating a configuration example of the transmission device 44 and the reception device 46. Referring to FIG. 12, the transmission device 44 and the reception device 46 include a network interface 1201, a processor 1202, and a memory 1203. The network interface 1201 is used to communicate with other network node devices constituting the communication system. The network interface 1201 may include, for example, a network interface card (NIC) compliant with IEEE 802.3 series.

The processor 1202 reads out and executes software (computer program) from the memory 1203, thereby performing the processing of the transmission device 44 and the reception device 46 described using the flowcharts in the above-described embodiment. The processor 1202 may be, for example, a microprocessor, an MPU (Micro Processing Unit), or a CPU (Central Processing Unit). The processor 1202 may include a plurality of processors.

The memory 1203 is configured by a combination of a volatile memory and a nonvolatile memory. Memory 1203 may include storage located remotely from processor 1202. In this case, the processor 1202 may access the memory 1203 via an I / O interface not shown.

In the example of FIG. 12, the memory 1203 is used for storing software module groups. The processor 1202 can perform the processing of the transmission device 44 and the reception device 46 described in the above-described embodiment by reading these software module groups from the memory 1203 and executing them.

As described with reference to FIG. 12, each of the processors included in the transmission device 44 and the reception device 46 executes one or a plurality of programs including a group of instructions for causing a computer to execute the algorithm described with reference to the drawings. To do.

In the above example, the program can be stored using various types of non-transitory computer-readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (Random Access Memory)) are included. The program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

In addition, this indication is not restricted to the said embodiment, It can change suitably in the range which does not deviate from the meaning.

As mentioned above, although this indication was explained with reference to an embodiment, this indication is not limited by the above. Various changes that can be understood by those skilled in the art can be made to the configurations and details of the present disclosure within the scope of the present disclosure.

This application claims priority based on Japanese Patent Application No. 2016-077788 filed on April 8, 2016, the entire disclosure of which is incorporated herein.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
A first transmission unit that transmits a packet to a communication device that is opposed to the communication device via a first communication line;
A second transmission unit that transmits a packet to the communication device that is opposed to the communication device via a second communication line;
A packet generator that duplicates a packet and generates a plurality of packets;
A monitoring unit for monitoring communication states of the first communication line and the second communication line;
In accordance with the communication state, it is determined that at least one of the first communication line and the second communication line is used, and two or more packets among a plurality of copied packets are transmitted to the facing communication device. And a control unit.
(Appendix 2)
The monitoring unit cannot transmit a packet to the facing communication device via the first communication line, and transmits a packet to the facing communication device via the second communication line. If it is determined that
The controller is
The communication apparatus according to appendix 1, wherein two or more packets among the plurality of packets generated by the packet generator are determined to be transmitted from the second transmitter.
(Appendix 3)
The controller is
In the monitoring unit, when it is determined that the communication quality in the second communication line is lower than a predetermined communication quality, two or more packets among the plurality of packets generated in the packet generation unit Decide to transmit from the second transmitter,
If the monitoring unit determines that the communication quality in the second communication line is higher than a predetermined communication quality, the monitoring unit determines not to transmit a redundant packet from the second transmission unit; 2. The communication device according to 2.
(Appendix 4)
The controller is
When transmitting two or more packets from the first transmitter or the second transmitter, or when transmitting two or more packets from the first transmitter and the second transmitter, respectively. The communication apparatus according to any one of appendices 1 to 3, wherein a period exceeding a predetermined period is set as a packet transmission interval.
(Appendix 5)
The controller is
When transmitting a packet using the first communication line and the second communication line, the second transmission is performed after a predetermined period has elapsed after the packet is transmitted from the first transmission unit. The communication device according to any one of appendices 1 to 4, wherein the communication device transmits a packet from a unit.
(Appendix 6)
The first communication line is a communication line managed by a communication carrier different from the communication carrier managing the second communication line, and a wireless communication method different from a wireless communication method used in the second communication line. The communication apparatus according to any one of appendices 1 to 5, wherein the communication line uses a frequency different from the frequency used in the second communication line.
(Appendix 7)
The communication apparatus according to any one of appendices 1 to 6, wherein the first communication line is a mobile network line including a wireless communication line, and the second communication line is a wired communication line.
(Appendix 8)
The communication apparatus according to any one of appendices 1 to 6, wherein the first communication line and the second communication line are wired communication lines.
(Appendix 9)
The controller is
The communication apparatus according to any one of appendices 1 to 7, wherein a sequence number indicating a packet order is set in a packet transmitted from the first transmission unit and the second transmission unit.
(Appendix 10)
The monitoring unit
Remarks 1 to 9 for receiving information on communication states of the first communication line and the second communication line from the opposing communication device via the first communication line and the second communication line. The communication device according to any one of the above.
(Appendix 11)
The monitoring unit
Remarks 1 to 1 for receiving information related to communication states of the first communication line and the second communication line from a management device that manages information related to communication states of the first communication line and the second communication line. The communication device according to any one of 9.
(Appendix 12)
Depending on the communication state of the first communication line and the second communication line, using at least one of the first communication line and the second communication line, two or more packets among a plurality of copied packets A transmitting device for transmitting to the receiving device;
A communication system comprising: a receiving device that deletes duplicate packets when a plurality of duplicated packets are received via at least one of the first communication line and the second communication line.
(Appendix 13)
Monitoring the communication state of the first communication line and the second communication line;
Duplicate packets to generate multiple packets,
Depending on the communication state, two or more of a plurality of duplicated packets are transferred to the first communication line and the second communication line using at least one of the first communication line and the second communication line. The communication method which transmits to the communication apparatus which opposes via a communication line.
(Appendix 14)
Monitoring the communication state of the first communication line and the second communication line;
Duplicate packets to generate multiple packets,
Depending on the communication state, two or more of a plurality of duplicated packets are transferred to the first communication line and the second communication line using at least one of the first communication line and the second communication line. A program for causing a computer to execute transmission to an opposing communication device via a communication line.

DESCRIPTION OF SYMBOLS 10 Communication apparatus 11 Transmission part 12 Transmission part 13 Packet generation part 14 Control part 15 Monitoring part 20 Communication apparatus 31 Communication line 32 Communication line 40 Communication terminal 42 Network apparatus 44 Transmission apparatus 46 Reception apparatus 48 Management apparatus 51 Network 52 Network 61 Reception part 71 receiving unit 72 receiving unit 73 control unit 74 transmitting unit

Claims

First transmission means for transmitting a packet to a communication device facing the first communication line via a first communication line;
Second transmission means for transmitting a packet to the communication device facing the second communication line via a second communication line;
A packet generation means for replicating a packet to generate a plurality of packets;
Monitoring means for monitoring communication states of the first communication line and the second communication line;
In accordance with the communication state, it is determined that at least one of the first communication line and the second communication line is used, and two or more packets among a plurality of copied packets are transmitted to the facing communication device. And a control unit.
The monitoring means cannot transmit a packet to the opposing communication device via the first communication line, and transmits a packet to the opposing communication device via the second communication line. If it is determined that
The control means includes
The communication apparatus according to claim 1, wherein two or more packets among the plurality of packets generated by the packet generation unit are determined to be transmitted from the second transmission unit.
The control means includes
In the monitoring unit, when it is determined that the communication quality in the second communication line is lower than a predetermined communication quality, two or more packets among the plurality of packets generated in the packet generation unit are Decide to transmit from the second transmission means,
The said monitoring means determines not to transmit a redundant packet from the said 2nd transmission means, when it determines with the communication quality in a said 2nd communication line being higher than predetermined communication quality. Or the communication apparatus of 2.
The control means includes
When transmitting two or more packets from the first transmission means or the second transmission means, or when transmitting two or more packets from each of the first transmission means and the second transmission means The communication apparatus according to claim 1, wherein a period exceeding a predetermined period is set as a packet transmission interval.
The control means includes
When transmitting a packet using the first communication line and the second communication line, the second transmission is performed after a predetermined period has elapsed after the packet is transmitted from the first transmission unit. The communication apparatus according to any one of claims 1 to 4, wherein the packet is transmitted from the means.
The first communication line is a communication line managed by a communication carrier different from the communication carrier managing the second communication line, and a wireless communication method different from a wireless communication method used in the second communication line. The communication apparatus according to any one of claims 1 to 5, wherein the communication apparatus uses a communication line that uses a frequency different from a frequency used in the second communication line.
The communication device according to any one of claims 1 to 6, wherein the first communication line is a mobile network line including a wireless communication line, and the second communication line is a wired communication line.
The communication device according to any one of claims 1 to 6, wherein the first communication line and the second communication line are wired communication lines.
The control means includes
The communication apparatus according to claim 1, wherein a sequence number indicating a packet order is set in a packet transmitted from the first transmission unit and the second transmission unit.
The monitoring means includes
The information on the communication state of the first communication line and the second communication line is received from the opposing communication device via the first communication line and the second communication line. The communication device according to any one of 9.
The monitoring means includes
The information regarding the communication state of the first communication line and the second communication line is received from a management device that manages the information regarding the communication state of the first communication line and the second communication line. The communication device according to any one of 1 to 9.
Depending on the communication state of the first communication line and the second communication line, using at least one of the first communication line and the second communication line, two or more packets among a plurality of copied packets A transmitting device for transmitting to the receiving device;
A communication system comprising: a receiving device that deletes duplicate packets when a plurality of duplicated packets are received via at least one of the first communication line and the second communication line.
Monitoring the communication state of the first communication line and the second communication line;
Duplicate packets to generate multiple packets,
Depending on the communication state, two or more of a plurality of duplicated packets are transferred to the first communication line and the second communication line using at least one of the first communication line and the second communication line. The communication method which transmits to the communication apparatus which opposes via a communication line.
Monitoring the communication state of the first communication line and the second communication line;
Duplicate packets to generate multiple packets,
Depending on the communication state, two or more of a plurality of duplicated packets are transferred to the first communication line and the second communication line using at least one of the first communication line and the second communication line. A non-transitory computer-readable medium storing a program that causes a computer to execute transmission to an opposite communication device via the communication line.